Etymology and distribution of 肥沢.

Koezawa 【肥沢】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Nagano-ken , Saga-ken , Fukuoka-ken . Distribution including Mizuzo also.

① Nagano-ken Matsumoto-shi Originated from the three grooves of Ueno's small character. Place names are also written as "Left Groove" and "Saw Groove" in Warring States Period.

② Birth of Saga-ken Saga-shi Shinojo (formerly Mitsuzo). Place name with a record in the Edo period. Saga-ken Saga-shi The inside of the castle was in the Edo period in the Saga Samurai of the Clan office.